Question

Urgent help please

The numbers 18,p,13,q,15,r,7 have a mean of 11.
The mean of p,q and r is?

Answer 1

Mean is the arithmatic average of a given data set. So,

`Mean= (Sum of the data)/(Number of the data)`

There are seven data in the data set.

According to the given problem,

`(18+p+13+q+15+r+7 )/(7) =11`

`(53+p+q+r )/(7) =11` Combine the like terms of the numerator.

`(53+p+q+r )/(7)*7 =11 *7` Multiplying 7 to each sides of equation.

53 + p + q + r = 77

53 + p + q + r - 53 = 77 - 53 Subtract 53 from each sides.

p + q + r = 24

Next step is to divide each sides by 3 so that we can write this in form of mean of p, q and r. Therefore,

`(p + q + r)/(3) =(24)/(3)`

So, mean of p, q and r = 8.

I hope this helps you!.